251622442 has 16 divisors (see below), whose sum is σ = 381091392. Its totient is φ = 124596160.

The previous prime is 251622431. The next prime is 251622523. The reversal of 251622442 is 244226152.

It is a self number, because there is not a number n which added to its sum of digits gives 251622442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255483 + ... + 256465.

It is an arithmetic number, because the mean of its divisors is an integer number (23818212).

Almost surely, 2^251622442 is an apocalyptic number.

251622442 is a deficient number, since it is larger than the sum of its proper divisors (129468950).

251622442 is a wasteful number, since it uses less digits than its factorization.

251622442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093.

The product of its digits is 7680, while the sum is 28.

The square root of 251622442 is about 15862.6114495691. The cubic root of 251622442 is about 631.3203534044.

Adding to 251622442 its reverse (244226152), we get a palindrome (495848594).

The spelling of 251622442 in words is "two hundred fifty-one million, six hundred twenty-two thousand, four hundred forty-two".